Spatial and Temporal Distribution of Total Phosphorus in the Sediments of Each Function Area in Shuangtai Estuary Wetland

In order to fully understand and grasp the wetland sediments biogenic elements migrate dynamic and provide baseline data for the environment restoration of the wetland. The sediment of 0-50 cm from Shuangtai estuary function area included the experimental area, buffer area and core area were collected to study the spatial and vertical distribution of different total phosphorus, and the period of the reed growth were also studied. TP concentrations were determined in the sieved samples via alkali fusion ——TP-Mo-Sb colorimetry. Results showed that the concentrations of total phosphorus(TP) of sediments in the function area were not high, ranging from0.001-0.781g·kg-1, content varied between different regions were great, core area buffer area experimental area, total phosphorus in sediments had increased from the northeast to the southwest. Concentrations of TP decreased with the depth, and reached the highest at the depth of 0-10 cm. According to ANOVA and LSD multiple comparisons showed that it was significant difference among three levels which were 0-10, 10-20, 20-30 cm levels, however, the other two levels between 30-40 cm and 40-50 cm the difference was not significant. Along with Reed Growth, the trend of the wetland sediment total phosphorus content was that the germination period dropped, developmental and reproductive stage increased first and then dropped, maturity slight increased in the end. The highest total phosphorus content appeared in June, while the minimum appeared in September. The natural growth of vegetation will greatly reduce the human and other factors that caused the total phosphorus accumulated in sediment. It is of great significance for vegetation to improve the spatial distribution of phosphorus, control of water pollution and eutrophication.